One coffee
A Seongsu day keeps one coffee, the shoe lane, and one stretch of warehouse street. After Yeonmujang, enter Seoul Forest. The river is at Ttukseom — not the Jamsil tower. Konkuk only if you still have legs, and if you extend, stop there. Do not open another south line. Do not attach Garosu-gil or COEX. Finish the coffee and walk. Do not turn the back streets into a restaurant list. In rain, stay inside a warehouse. Save the forest and the river for a clear day. One coffee. You do not need a list of shop names. The shoe lane is a branch: one stretch, then back to the warehouse lanes and into Seoul Forest. Konkuk is not a second Seongsu.